OgreShaderExDualQuaternionSkinning.h

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/*
-----------------------------------------------------------------------------
This source file is part of OGRE
(Object-oriented Graphics Rendering Engine)
For the latest info, see http://www.ogre3d.org

Copyright (c) 2000-2012 Torus Knot Software Ltd
Permission is hereby granted, free of charge, to any person obtaining a copy
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The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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THE SOFTWARE.
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*/
#ifndef _ShaderExDualQuaternionSkinning_
#define _ShaderExDualQuaternionSkinning_

#include "OgreShaderPrerequisites.h"

#ifdef RTSHADER_SYSTEM_BUILD_EXT_SHADERS
#include "OgreShaderExHardwareSkinningTechnique.h"
#include "OgreShaderParameter.h"
#include "OgreRenderSystem.h"
#include "OgreShaderFunctionAtom.h"

namespace Ogre {
namespace RTShader {

#define SGX_LIB_DUAL_QUATERNION             "SGXLib_DualQuaternion"
#define SGX_FUNC_BLEND_WEIGHT               "SGX_BlendWeight"
#define SGX_FUNC_ANTIPODALITY_ADJUSTMENT        "SGX_AntipodalityAdjustment"
#define SGX_FUNC_CALCULATE_BLEND_POSITION       "SGX_CalculateBlendPosition"
#define SGX_FUNC_CALCULATE_BLEND_NORMAL         "SGX_CalculateBlendNormal"
#define SGX_FUNC_NORMALIZE_DUAL_QUATERNION      "SGX_NormalizeDualQuaternion"
#define SGX_FUNC_ADJOINT_TRANSPOSE_MATRIX       "SGX_AdjointTransposeMatrix"
#define SGX_FUNC_BUILD_DUAL_QUATERNION_MATRIX       "SGX_BuildDualQuaternionMatrix"

class _OgreRTSSExport DualQuaternionSkinning : public HardwareSkinningTechnique
{
// Interface.
public:
    DualQuaternionSkinning();

    virtual bool resolveParameters (ProgramSet* programSet);

    virtual bool resolveDependencies (ProgramSet* programSet);

    virtual bool addFunctionInvocations (ProgramSet* programSet);

// Protected methods
protected:
    void addPositionCalculations(Function* vsMain, int& funcCounter);

    void adjustForCorrectAntipodality(Function* vsMain, int index, int& funcCounter, const ParameterPtr& pTempWorldMatrix);

    void addIndexedPositionWeight(Function* vsMain, int index, ParameterPtr& pWorldMatrix,
                      ParameterPtr& pPositionTempParameter, ParameterPtr& pPositionRelatedOutputParam, int& funcCounter);
    
    void addNormalRelatedCalculations(Function* vsMain,
                        ParameterPtr& pNormalRelatedParam,
                        ParameterPtr& pNormalWorldRelatedParam,
                        int& funcCounter);

protected:
    UniformParameterPtr mParamInScaleShearMatrices;
    ParameterPtr mParamLocalBlendPosition;
    ParameterPtr mParamBlendS;
    ParameterPtr mParamBlendDQ;
    ParameterPtr mParamInitialDQ;
    ParameterPtr mParamTempWorldMatrix;

    ParameterPtr mParamTempFloat2x4;
    ParameterPtr mParamTempFloat3x3;
    ParameterPtr mParamTempFloat3x4;
    
    ParameterPtr mParamIndex1;
    ParameterPtr mParamIndex2;

};

}
}

#endif
#endif